Bug 847988 (CVE-2012-3482)

Summary: CVE-2012-3482 fetchmail: DoS (crash) in the base64 decoder upon server NTLM protocol exchange abort right after the initial request
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: pertusus, vcrhonek
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=low,public=20120813,reported=20120813,source=oss-security,cvss2=5.0/AV:N/AC:L/Au:N/C:N/I:N/A:P,rhel-5/fetchmail=defer,rhel-6/fetchmail=defer,fedora-all/fetchmail=affected
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Bug Depends On: 847989    
Bug Blocks: 847991    

Description Jan Lieskovsky 2012-08-14 05:33:48 EDT
A denial of service flaw was found in the way Fetchmail, a remote mail retrieval and forwarding utility, performed base64 decoding of certain NTLM server responses. Upon sending the NTLM authentication request, Fetchmail did not check if the received response was actually part of NTLM protocol exchange, or server-side error message and session abort. A rogue NTML server could use this flaw to cause fetchmail executable crash.

Upstream patches:
[1] http://gitorious.org/fetchmail/fetchmail/commit/3fbc7cd331602c76f882d1b507cd05c1d824ba8b
[1a] https://gitorious.org/fetchmail/fetchmail/commit/c189f6a54f36f5b6f7734303db3cfc52311aab5f
[1b] https://gitorious.org/fetchmail/fetchmail/commit/b3e0cd2d558b5ccf06c816eed38c883d7462d3d4

Upstream advisory (not available yet):
[2] http://www.fetchmail.info/fetchmail-SA-2012-02.txt

CVE request:
[3] http://www.openwall.com/lists/oss-security/2012/08/13/9

References:
[4] https://bugs.gentoo.org/show_bug.cgi?id=431284
Comment 1 Jan Lieskovsky 2012-08-14 05:34:54 EDT
This issue affects the versions of the fetchmail package, as shipped with Fedora release of 16 and 17. Please schedule an update.
Comment 2 Jan Lieskovsky 2012-08-14 05:35:45 EDT
Created fetchmail tracking bugs for this issue

Affects: fedora-all [bug 847989]
Comment 4 Fedora Update System 2012-10-02 11:57:13 EDT
fetchmail-6.3.22-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 5 Stefan Cornelius 2012-10-05 03:11:25 EDT
Statement:

The Red Hat Security Response Team has rated this issue as having low security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.